That size will be perfect for starting out! There is nothing worse than a giant store with a bunch of empty space and shelves wth not enough inventory--that makes people think you're failing and they'll be reluctant to buy. You should be able to fill 500 square feet, and at that size you should expect to do $9,000 in gross sales a month (around $300 a day) once you start getting customers. So as long as you mark up the fabric enough, and your rent isn't too high, things should be good. (Around here 500 square feet of retail space would be $3,000/month, which cuts quite deep into $9,000, but from the sound of it I bet you got yourself an even better deal than that!)
~ Miss Fleecy